IPA: //ˈruːθləs//
KK: /ˈruːθləs/
Showing no kindness or mercy; being very harsh or cruel to others.
The ruthless businessman would do anything to get ahead, even if it meant hurting others.
Ruthless → It is formed from "ruth" (from Old English *rūð*, meaning pity or compassion) and the suffix "-less" (meaning without). The word "ruthless" means without pity or compassion.
Think of 'ruth' meaning pity and remember that 'ruthless' describes someone who is without pity.